Hepatitis B Surface Antigen Test

The hepatitis B surface antigen (HBsAg) test is a blood test that is used to detect the presence of the hepatitis B virus in the body. HBsAg is a protein on the surface of the hepatitis B virus that triggers the body's immune response.

The HBsAg test is typically performed as part of routine blood work or for individuals who are at high risk for hepatitis B infection. It can also be used to monitor the progression of a chronic hepatitis B infection and to determine if a person is a carrier of the virus.

A positive HBsAg test result indicates that the person is currently infected with the hepatitis B virus. Further testing may be needed to determine whether the infection is acute or chronic, and to assess the severity of liver damage.

It is important to consult a healthcare provider for proper interpretation of test results and appropriate treatment recommendations if hepatitis B infection is detected. Early detection and treatment of hepatitis B can help prevent serious complications such as liver damage, cirrhosis, and liver cancer.